Sorry to raise such an old thread but I have just picked up one of these Park Auto-Wah pedals, it's in need of some TLC. I wondered if anyone had ever drawn out the schematic for this at all. There are not many components inside and it shouldn't take long to trace but if it has already been done it could save me 20 minutes drawing it out.

It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

You are right, not your fault.In my opinion the capacitor C7 is installed incorrectly,because there is a negative DC voltage on the positive connection of it.Maybe it will not be noted in practice, because the amount of the voltage is very low.